GABRIEL STEFANESCU

Objective

As a IT infrastructure expert, I am looking for a Network/Systems Administrator position in a challenging environment where I can fully contribute to the company’s success and further develop my skills.

Overview

Over twenty five years in Information Technologies with deep knowledge in Network, Systems and Database Administration on different operating systems and hardware.

Superior knowledge and extensive experience in Windows, Linux and Solaris OS, setup, performance, cluster, deployment, hardening.

Mastering VMWare virtualization technology ESXi/vSpheare

Knowledge of HP, IBM and DELL hardware architecture and products with hands-on experience on IBM System X, IBM System P, HP blade servers, HP EVA, DELL EquaLogic iSCSI SAN.

Solid experience in networking - firewalls (Cisco ASA 5500 series, Cisco firepower, Juniper SRX Series, Checkpoint), Routing, L2/L3 switches ( HP Procurve/Aruba, Cisco Catalist), WiFi (Cisco Meraki, UniFi).

Network security: Cisco IDS/IPS, Rapid 7 Metasploit - NeXpose, Nessus, Nmap, Snort

Hands on experience on programming/scripting C,Python(Flask/Django frameworks), network automation scripting (Ansible/Chef).

Solid understanding of client/server, networking, and Internet technologies.

Strong experience in backup and disaster recovery using Veeam, Veritas Backup Exec, Acronis and HP DataProtector.

Working Experience

2017 – 2018 Alithya Inc – IT infrastructure Administrator

Implement security perimeter using Cisco 55xx and firepower services

Manage the network infrastructure switches, routers and firewalls

Design and implement remote office access over MPLS VPN network

Design and reconfigure network for dynamic routing protocols.

Implement WiFi solution - UniFi access point.

Maintained the visualized environment (ESXi, Hyper-V, Azure and Amazon cloud).

Migrate ESXi virtual environment from HP SAN to DellEqualogic storage.

Migrate Exchange 2010 to ShareWeb cloud solutions.

Migrate Eset AV from on premises to cloud solution.

Migrate Backup Exec solution to Veeam.

2010 – 2017 Systemware Inovation group of companies (Toronto, Ontario) IT Infrastructure Administrator

Manage Windows/Linux/Solaris servers infrastructure (ActiveDirectory, Exchange, SharePoint, IIS/Apache, Postfix, Sendmail, Bind, Jira, WordPress, Twiki, Apache Tomcat, Subversion).

Implement security perimeter using Cisco 55xx and firepower services.

Configure firepower policies for network protection

Configure and maintained the company firewalls, routers and switches

Deployed VPN solution, remote access and site to site VPN.

Build SandBox environment in Azure, Amazon Cloud for Development/QA teams

Build and maintained private cloud solution (Q9/Peer1) for financial sector application.

Virtualize the IT server infrastructure on VMWare ESXi solutions.

Implement monitoring of hardware infrastructure using Horizon OpenNMS.

Implement network hardware automatic backup using Ansible.

Deploy and administer Apache Hadoop cluster for Dev team.

Migrate SendMail email server to MS Exchange 2010.

Migrate the enterprise antivirus solution form McAfee to Eset.

Provide support to Dev/QA teams maintaining the software code on Apache subversion repositories.

Implement backup solution for virtualized infrastructure using BackupExec.

2007 – May 2010 xkoto Inc. (Toronto, Ontario), System

Implemented and managed all office IT infrastructure including Microsoft Exchange, Microsoft Developer Network (MSDN), Cisco VPN, Sophos Antivirus, VMware, Microsoft Windows, SuSE Linux, RedHat Linux, Sun Solaris, IBM AIX

Helped specify and source infrastructure

Diagnosed issues as required spanning security, backup/recovery, laptop problems etc. for both the Toronto and Boston offices.

Provided 2nd level support for all technical issues related to servers and networks.

2004 – 2007 Ontario Real Estate Association (North York, Ontario), System/Network Administrator

Supported all company servers and network equipment infrastructure on a Windows 2000/2003 and Linux RedHat OS technologies environment based on HP SAN and blades servers, IBM xSeries servers, Cisco firewalls and Nortel Switches.

Performed Hardware, OS and Database and other software application performance tuning and resources monitoring for testing and implementing in a production environment.

Managed all services and database administration for a CRM Sage – Accpac system application.

Administered clustered Microsoft Exchange 2003 and MS SQL 2000 environment.

Implemented and managed anti-spam protection based on Sophos PureMessage on RedHat Enterprise platform.

Implemented and managed IDS – Snort, ACID on Fedora Core platform.

Installed setup and secured all network servers, including Web servers, Email servers (Exchange Server 2K3 & Postfix on RedHat Fedora Core platform), FTP and DNS servers.

Fine tuning RAID systems (modifying raid levels, changing arrays strip size).

Upgraded, updated and patch Windows and Linux servers. Install WSUS for updating Windows servers and workstations.

Maintained antivirus system based on Symantec Enterprise Edition v.9 and Trend Antivirus v.7 for Microsoft Exchange 2K.

Implemented a disaster recovery procedure using DataProtector 5.5 on HP MSL6000 tape library.

Consolidated all hardware, OS services, software and application to assure the company’s day to day operations in case of various failures.

Monitored the hardware, OS and applications using HP Insight manager and Microsoft MOM.

Liaison with suppliers and manufacturers to support custom applications and hardware platforms

2003 Adastra Corporation (Markham, Ontario), System Administrator

Installed, configured and maintained servers, network equipment and software.

Maintained Windows 2000 Advanced server, Active Directory, DNS, DHCP, Lotus Notes email.

Installed, configured and maintained Data Warehouse and Data Mining systems (Microstrategy 7i, Informatica 5.1.1, AbInitio).

Maintained XP Professional workstations, Lotus Notes email clients, MS Office suite.

2001 – 2002 UTI Group (Bucharest, Romania),

Installed and managed Checkpoint on Nokia IP330 firewall, using CheckPoint/Smartview Reporter.

Configured and managed Biodata BigFire firewall with Biodata Bali administration software.

Configured and managed Biodata VPN.

Installed and monitored Anti-Virus and Anti-Spam software for e-mail servers.

Installed and configure e-mail servers (QMail 1.05 + VPopMail 5.2.1, Postfix 1.1.11 on RedHat 7 platforms) for all company’s domains.

Installed and configured Web servers (with Apache 1.3.24) on RedHat 7 for multi-domains.

Installed and configured DNS Server (Bind 8.3.4) for domains, and DHCP service on RedHat 7 platform for company’s internal use.

Installed and configured servers for Intranet using Apache (SSL mode), to be used for testing of company’s digital certification implementation.

Implemented a Graphic Monitored System of hardware equipments, servers and dedicated software application using Multi Router Traffic Grapher software (on SNMP protocol).

Configured and managed routers and switches.

Installed, configured and test the hardware equipment (Planet Vip-400, Vip-200) for implementation of a VOIP network for all company’s locations.

Monitored wireless equipment (Breezecom on 2.4 GHz) for urban inter network connectivity.

Provided network support for testing and implementation.

Modified the security, packet filtering, and port’s opening rules.

1998 – 2001 ProTruck International (Romania), System Administrator

Installed maintain and upgrade WEB, e-mail and DNS servers’ hardware and software.

Installed local area networks and secure the Internet connection.

Implement network traffic and security monitoring software.

Installed bind - DNS, Apache, Squid, DHCP service on RedHat platform.

Optimized server performance.

Configured and tuning server’s RAID system.

Installed Anti-Virus programs on e-mail server and workstations.

Administered financial systems based on Oracle 8i platform.

Implemented full System Tape Backup and Disaster Recovery Operations for database system.

Installed, maintain computer hardware and operating system software (Windows 2000/Me/9x).

Provided user support on dedicated application.

Prepared reports, manuals and other documentation.

1997 – 1998 Public Transport Company of Bucharest (Romania), SAP R3 administrator

Implemented and maintained SAP/R3 base module (on Oracle 8i / NT4 platform)

1993 – 1997 Public Transport Company of Bucharest (Romania), software developer

Analyzed, designed and developed payroll and financial software using Microsoft Visual C++ and SQL, Java, Visual Basic, FoxPro, Access

Implemented GIS (Geographic Information Systems) software, using MapBasic compiler and MapInfo software, for company’s routes map management and information exchange with other companies.

Identified technical problems presenting solutions and fixes.

Prepared reports, manuals and other documentation.

Education

Polytechnic University of Bucharest – Faculty of Computers and Automatics.

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